Niobium strip products are strip products made of high purity metal niobium, which can be used as an additive to iron, nickel and zirconium based super alloys to improve their strength properties. Niobium and niobium alloy are high temperature resistant materials. Among the four "space metals" of aerospace, tungsten, molybdenum, tantalum and niobium, niobium alloy has the best comprehensive performance, showing good plasticity and excellent processing and welding performance. In recent years, with the continuous development of aviation and aerospace industry, the application range of niobium alloys has been further expanded, and it is widely used in aircraft, rocket engine structural components and thermal protection system materials. The application under the above harsh conditions puts forward higher requirements for the quality of niobium alloys, especially niobium strips, which are one of the important raw materials.
Aiming at the above technical problems, one purpose of the invention is to provide a new preparation method for niobium strips. Based on the existing production process, some process parameters were optimized, which not only effectively reduced the gas impurities such as carbon, oxygen, nitrogen and hydrogen in the pre-bonded niobium strip, but also effectively controlled the high melting point impurities such as Ta, Mo and W, and greatly reduced the low melting point impurities such as Fe, Cr, Ni and Al.
Another object of the invention is to provide niobium strips prepared by the preparation method.
In order to realize the above purpose, the invention adopts the following technical scheme:
The invention relates to a niobium strip preparation method, which takes niobium oxide of 99.99% purity as raw material and comprises the following steps:
1) Carbon: niobium oxide and carbon black are evenly mixed to obtain a mixture;
2) Carbonization: the mixture obtained in the carbon matching step is carbonized in the carbonization furnace to obtain niobium carbide;
3) Vacuum reduction: the return raw material is reduced and sintered in the vacuum reduction furnace to obtain the reduced sinter;
4) Hydrogenation-dehydrogenation: the reduction sinter obtained in the vacuum reduction step is hydrogenated, pulverized and dehydrogenated;
5) Molding: the material obtained in the hydrogenation step is pressed and formed;
6) Pre-bonding: The material obtained in the forming step is pre-bonded in a vacuum reduction furnace to obtain the niobium strip.
